Specify input and output file paths

src/main.rs

@@ -2,6 +2,9 @@ use anyhow::{
     Context,
     Result,
 };
+use clap::{
+    Parser,
+};
 use feed_rs::{
     parser::parse,
     model::Feed,
@@ -12,6 +15,17 @@ use reqwest::{
     Url,
 };
 
+#[derive(Parser)]
+#[command(version, about, long_about = None)]
+struct Cli {
+    /// Path to file containing feeds
+    #[arg(long, default_value_t = String::from("feeds.txt"))]
+    feeds: String,
+    /// Path to output file
+    #[arg(long, default_value_t = String::from("index.html"))]
+    out: String,
+}
+
 fn fetch_feed(url: impl IntoUrl) -> Result<Feed> {
     let content = reqwest::blocking::get(url)?.bytes()?;
     Ok(parse(&content[..])?)
@@ -38,10 +52,11 @@ fn read_feed_file(path: &str) -> Result<Vec<Url>> {
 }
 
 fn main() -> Result<()> {
+    let cli = Cli::parse();
 
     let mut feed_items = Vec::new();
 
-    let feeds = read_feed_file("feeds.txt")?;
+    let feeds = read_feed_file(&cli.feeds)?;
 
     for feed_url in feeds {
         feed_items.extend(fetch_feed(feed_url)?.entries);
@@ -60,7 +75,7 @@ fn main() -> Result<()> {
     out.push_str("<ul>\n");
 
     for item in feed_items {
-        out.push_str(&format!("<li><a href=\"{}\">{}</a> ({})</li>\n", item.links.first().context("No link found")?.href, item.title.context("No title found")?.content, item.published.context("")?));
+        out.push_str(&format!("<li><a href=\"{}\">{}</a> ({})</li>\n", item.links.first().context("No link found")?.href, item.title.context("No title found")?.content, item.published.context("No publishing time")?));
     }
 
     out.push_str("</ul>\n");
@@ -68,7 +83,8 @@ fn main() -> Result<()> {
     out.push_str("</body>\n");
     out.push_str("</html>\n");
 
-    std::fs::write("index.html", out)?;
+    std::fs::write(&cli.out, out)
+        .context("Failed to write output to file")?;
 
     Ok(())
 }